Linux+ XK0-005 Exam Questions and Answers PDF

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Question 12

A Linux engineer needs to block an incoming connection from the IP address 2.2.2.2 to a secure shell server and ensure the originating IP address receives a response that a firewall is blocking the connection. Which of the following commands can be used to accomplish this task?

Options:

iptables -A INPUT -p tcp -- dport ssh -s 2.2.2.2 -j DROP

iptables -A INPUT -p tcp -- dport ssh -s 2.2.2.2 -j RETURN

iptables -A INPUT -p tcp -- dport ssh -s 2.2.2.2 -j REJECT

iptables -A INPUT -p tcp -- dport ssh -s 2.2.2.2 -j QUEUE

Question 13

A junior developer is unable to access an application server and receives the following output:

The systems administrator investigates the issue and receives the following output:

Which of the following commands will help unlock the account?

Options:

Pam_tally2 --user=dev2 —-quiet

pam_ tally2 --user=dev2

pam_tally2 -–user+dev2 —-quiet

pam_tally2 --user=dev2 —-reset

Question 14

A security team discovers that a web server has been running with elevated privileges and identifies it as a security violation. Which of the following items needs to be added to the webserver.service file to remediate the issue?

Options:

In the [Service] section of the webserver.service file, add User=comptia.

In the [Unit] section of the webserver.service file, add AllowIsolate=true.

In the [Install] section of the webserver.service file, add WantedBy=single.target.

Add After=network.target to the [Install] section of the webserver.service file.

Question 15

A systems administrator is checking the system logs. The administrator wants to look at the last 20 lines of a log. Which of the following will execute the command?